SFI System
2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0500: Vehicle Speed Sensor "A"
P0500 - Vehicle Speed Sensor "A"
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of these pulse signals.
MONITOR DESCRIPTION
If there is no speed signal from the combination meter even though the ECM determines that the vehicle is being driven, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and sets the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
CONFIRMATION DRIVING PATTERN
* Connect the Techstream to the DLC3.
* Turn the ignition switch to ON and turn the Techstream on.
* Clear the DTCs (even if no DTCs are stored, perform the Clear DTC procedure) DTC Check / Clear.
* Turn the ignition switch off and turn the Techstream off.
* Turn the ignition switch to ON and turn the Techstream on [A].
* Start the engine.
* Drive the vehicle at 15 mph (24 km/h) or more for a total of 30 seconds or more [B].
* Stop the vehicle.
* Enter the following menus: Powertrain / Engine / Utility / All Readiness.
* Input the DTC: P0500.
* Check the DTC judgment result [C].
HINT
If the judgment result shows ABNORMAL, the system has a malfunction.
* If the test result is UNKNOWN, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
* Read Pending DTCs.
HINT
If a pending DTC is output, the system is malfunctioning.
* If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
Read freeze frame data using the Techstream or the OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.
PROCEDURE
1. READ VALUE USING TECHSTREAM (VEHICLE SPEED)
(a) Drive the vehicle and check whether the operation of the speedometer in the combination meter is normal.
HINT
- The vehicle speed sensor is operating normally if the speedometer reading is normal.
- If the speedometer does not operate, check it by following the procedure described in speedometer malfunction.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Select the following menu items: Powertrain / Engine / Data List / Vehicle Speed.
(f) Drive the vehicle.
(g) Read the value displayed on the tester.
OK:
Vehicle speeds displayed on tester and speedometer display are equal.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
A -- Continue to next step.
2. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)
(a) Inspect the combination meter using an oscilloscope.
(1) Shift the transmission gear selector lever to the neutral position.
(2) Jack up the vehicle.
(3) Turn the ignition switch to ON.
(4) Measure the voltage between the terminal of the combination meter and body ground while the wheel is turned slowly.
Standard voltage:
HINT
The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.
NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)
(a) Disconnect the combination meter connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance.
Standard resistance (Check for open):
(d) Reconnect the combination meter connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal
4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)
(a) Disconnect the combination meter connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance.
Standard resistance (Check for short):
(d) Reconnect the combination meter connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- GO TO SPEED SIGNAL CIRCUIT Speed Signal Circuit